Which method of Wi-Fi mapping involves creating symbols in public places to identify open Wi-Fi networks?

The method of Wi-Fi mapping that involves creating symbols in public places to identify open Wi-Fi networks is known as WarChalking. This practice includes marking specific symbols on sidewalks or walls to indicate the presence and status of wireless networks. These symbols are often used to communicate whether a network is secure, unsecured, or requires specific access credentials. WarChalking emerged as a way to document and share information about accessible Wi-Fi networks, making it easier for users to find connections in urban areas.

The other methods listed, while related to the exploration and mapping of Wi-Fi networks, do not involve the act of symbolically marking locations. WarDriving, for instance, refers to driving around in a vehicle while collecting data on Wi-Fi networks, often visualized using GPS technology. WarFlying involves using drones to discover wireless networks from the air, and WarWalking is similar to WarDriving but typically done on foot without the mobility of a vehicle. Thus, WarChalking specifically stands out for its unique aspect of using physical symbols to communicate information about Wi-Fi networks in public spaces.